Abstract: Knowledge of past natural flood variability and controlling climate factors is of high value, since it can be useful to refine projections of the future flood behavior under climate warming. In this context, we present a seasonally resolved 2000-year long flood-frequency and -intensity reconstruction from the southern Alpine slope (North-Italy) using annually laminated (varved) lake sediments. Floods occurred predominantly during summer and autumn, whereas winter and spring events were rare. The all-season flood frequency, and particularly the occurrence of summer events, increased during solar minima, suggesting solar-induced circulation changes resembling negative conditions of the North Atlantic Oscillation as controlling atmospheric mechanism. Furthermore, the most extreme autumn events occurred during a period of warm Mediterranean sea-surface temperature. Interpreting these results in regard to present climate change, our dataset proposes for a warming scenario a decrease in summer floods but an increase in the intensity of autumn floods at the South-Alpine slope.

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Looks like as if the paper also implicitly states that the sun is responsible for the recent climate trend. It notes that Summer floods increase during Solar Minima and Autumn Floods increase with warming. They then say in the last sentence of the abstract, "Interpreting these results in regard to present climate change, our dataset proposes for a warming scenario a decrease in summer floods but an increase in the intensity of autumn floods at the South-Alpine slope." Thus, the increased solar activity creates a decrease in Summer Floods, and also an increase in Autumn Floods, since it causes warming.

I could be misinterpreting the paper, but that's what the last sentence came off to me as.